4. [20 points] Suppose a 1100 1101 0100, b 1011 0010 0101, 0100 0101 1001. Compute the following using binary operations assuming 12-bit two's complement. Express your final an- swers in both binary and hec bok inks. Oogle Doce -(a & a) a. b. alblc (a&c)Ib C. e. ((a & b) (b l c) (continued on back)